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Full Discussion: vmstat vs uptime?
Top Forums UNIX for Advanced & Expert Users vmstat vs uptime? Post 302086840 by blowtorch on Monday 28th of August 2006 03:29:24 AM
Old 08-28-2006
Are you running the vmstat like this?
Code:
while true; do
   vmstat
   sleep 300 # measure every five min or something similar
done

If you are, then that's your problem right there. From the vmstat man page:
Quote:
Without options, vmstat displays a one-line summary of the virtual memory activity since the system was booted.
This figure will hardly change over 3.5 hours (especially if your system has an uptime that can be measured in months).
 

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uptime(1)						      General Commands Manual							 uptime(1)

NAME
uptime, w - show how long system has been up and/or who is logged in and what they are doing SYNOPSIS
[user] [pset_list]] [user] [pset_list]] DESCRIPTION
prints the current time, the length of time the system has been up, the number of users logged on to the system, and the average number of jobs in the run queue over the last 1, 5, and 15 minutes for the active processors. is linked to and prints the same output as displaying a summary of the current activity on the system. Options and recognize the following options: Print the current time, the length of time the system has been up, and the number of users logged on to the system in the first line of the output. The average number of jobs in the core over the last 1, 5, and 15 minutes for the active processors is also printed. When used with the option, the load averages for the processor sets (psets) are calculated on a core basis. Suppress the first line and the heading line. This option should not be used with the option. This option assumes the use of the option to Use long output. This option assumes the use of the option to Print the current time, the length of time the system has been up, and the number of users logged on to the system in the first line of the output. The load averages over the last 1, 5, and 15 minutes for the processor sets (psets) given in the command line, pset_list, are displayed in the subsequent lines. If no arguments are given, the load averages are displayed for all the psets in the system. If pset id of an empty pset is given in the command line, a corresponding message will be displayed. If the kernel does not have the pset capability, gives an error. The option cannot be used along with other options except Use the short form of output for displaying terminal information. The terminal name is abbreviated, and the login time and CPU times are suppressed. Print only the first line describing the overall state of the system. This is the default for the command. Print a summary of the current activity on the system for each user. This is the default for the command. EXAMPLES
The command: produces text resembling the following: depending upon the current status of the system. The command: gives the load average of all the psets in the system. If 0, 94, 95, and 97 are existing psets in the system, the output will look like the following: The command: gives output which looks like the following if 94 and 95 are valid pset ids: The command: gives the load average of the system, producing output resembling the following: The command: gives the load average of all the psets in the system. If 0 and 1 are psets in the system, the output will look like the following: AUTHOR
was developed by the University of California, Berkeley and HP. SEE ALSO
mpctl(2), pset_ctl(2). uptime(1)
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